One reason that dislocation motion is difficult in covalently bonded materials such as diamond is that:
(a) The interatomic distance is large.
(b) Covalent bonds resist changes in angle.
(c) The curvature of the interatomic potential is low.
(d) The interatomic potential is shallow.
(b) Covalent bonds resist changes in angle.
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Polaris is a second magnitude star, and Phi Pegasi is about 16 times fainter than Polaris. What is the approximate magnitude of Phi Pegasi?
a. 18 b. ?14 c. 3 d. ?3 e. 5
Diffraction Gratings: An 18-mm-wide diffraction grating has rulings of 710 lines per millimieter. Monochromatic light of wavelength 506 nm wavelength is incident normally on the grating. What is the largest angle from the centerline at which an intensity maximum is formed?
A. 46° B. 44° C. 42° D. 40° E. 38°
Scientist use the term "blackbody" to indicate a surface that will not emit any color of visible light.
Answer the following statement true (T) or false (F)
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular speed of 200 revolutions per minute, then the tangential velocity of a point on the circumference is
A. 1.06 m/s. B. 1.26 m/s. C. 1.39 m/s. D. 1.62 m/s. E. 1.32 m/s.